Two Ingredients. Real Hair Transformations. How Neurogan Health's GHK Cu Serum Is Changing What Customers Expect From Hair Care GHK Cu vs AHK Cu: Which Copper Peptide Is More Effective? Ghk Cu Peptides Hair Before And After Before and after begins with consistency. Our 10% GHK Cu formula is engineered for deep absorption to support scalp health and visible density. Before vs. after 3 months of GHK Cu peptide therapy smoother texture, more even tone, and skin that looks healthier overall. Small peptide, big difference